Groves has been a senior research fellow for the conservative Heritage Foundation for the past 10 years, according to his LinkedIn page. He previously served as a senior counsel for the Senate Permanent Subcommittee on Investigations and was an assistant attorney general in Florida.

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Bloomberg noted that he called for the U.S. to “sever relations” with the U.N. Human Rights Council after its criticisms of Israel and supported the U.S. pullout from the Paris climate change agreement.

Wachtel was a Fox News journalist who covered domestic and international news. He previously reported on the U.N. Security Council and General Assembly, according to PassBlue, a news outlet focusing on the U.N.

Their departures come during increased tensions between the United States and North Korea.

Pyongyang has successfully launched two different ballistic missiles that it claims would be able to reach the U.S. It was revealed earlier this week that the nation has developed miniaturized nuclear weapons that would fit on a missile.

President Trump recently issued a severe warning to North Korea, saying continued threats would be met with “fire, fury and, frankly, power.”

“He has been very threatening beyond a normal state, and as I said they will be met with fire, fury and frankly power, the likes of which this world has never seen before,” Trump told reporters while on vacation at his New Jersey golf club, referring to North Korea's leader, Kim Jong Un.

The Security Council passed sanctions against Pyongyang on Saturday after urging from Haley. Trump also signed sanctions against North Korea as part of a sanctions package against Russia.